Improvement in the method of tempering- steel



GEORGE DAVIS, OF ELIZABETH PORT, NEW JERSEY.

Letters Patent No. 85,797, dtl tfitl lltnuar'y 12, 1869.

mPROVEmNT IN THE IVIETHOD OF TEMPERING- STEEL.

The Schedule referred in these Letter-a Patent and making part of the ame.

To all whomwlt may concern Be it known that I, GEORGE DAVIS, of Elizabethport, in the countyof Union, and State of New Jersey, have invented a new and useful Improvement in the Method of Tempering Steel; and I do hereby declare that the following is a full, clear, and exact description .thereof, which will enable others skilled in the art to make and use the same.

This invention relates to a new manner of tempering already completed steel or other tools and articles, and consists of "a mixture of sand and water, which mixture is placed in a barrel or other suitable receptacle, the object being to regulate the degree of temper bythc amount of water with which the iron is brought in con- The tool is heated to a red heat, and is then immersed in the mixture. Its heat absorbs the water, until all the surrounding Water is absorbed, when the surrounding dry sand prevents the further tempering of the tool, as it prevents moisture from the mixture or from the atmosphere fi'om reaching the steel. The quantity or water, therefore, \Yhich is mixed with the sand, regulate 4 the temper of the steel, and the latter can consequently be tempered to any desired degree.

It will be understood that this invention does not at all relate to the manufacture of iron or steel, nor to the tempering ofsteel during the manufacture of the some, out only to the tempering of already-finished tools or articles.

Having thus described my invention,

I claim as new, and desire to secure by Letters I Pate nt Tempering finished tools in a mixture of sand and water, by the herein-described process.

i GEORGE DAVIS. Witnesses:

' Josnrn ALWABD,

Jenn R. Hoovnn. 

